Apparatus and Method for Transmitting Multimedia Data in Hybrid Network

1. A method for transmitting a packet in a multimedia system, the method comprising: identifying a moving picture experts group media transport (MMT) packet including a header region and a payload, wherein the MMT packet is different from a real-time transport protocol (RTP) packet; and transmitting the identified MMT packet to a receiving entity, wherein information in the header region of the MMT packet comprises: data unit type information including a value indicating whether the payload includes a data unit of a complete type, an indicator used to distinguish media data to which the MMT packet belongs from another media data, a one-bit flag, wherein if the one-bit flag has a first value the one-bit flag indicates that the payload includes only one data unit, and if the one-bit flag has a second value the one-bit flag indicates that the payload includes more than one data unit, and payload type information indicating whether the payload includes one or more control messages.

2. The method of claim 1 , wherein if the value indicates that the payload does not include the data unit of the complete type, the value further identifies a position for an incomplete portion of the data unit.

3. The method of claim 2 , wherein the position indicates one of that the incomplete portion is a first fragment of the data unit, the incomplete portion is a last fragment of the data unit, and the incomplete portion is a fragment except for the first fragment and the last fragment among fragments of the data unit.

4. The method of claim 1 , wherein a packet header included in the header region comprises bitrate type information indicating whether a bit rate of the MMT packet is a constant bit rate (CBR), identification information related to a quality of service (QoS) of the MMT packet, and information related to a transmission delay of the MMT packet.

5. A method for receiving a packet in a multimedia system, the method comprising: receiving, from a transmitting entity, a moving picture experts group media transport (MMT) packet including a header region and a payload, wherein the MMT packet is different m transport protocol (RTP) packet; and processing data in the payload based on information in the header region, wherein information in the header region of the MMT packet comprises: data unit type information including a value indicating whether the payload includes a data unit of a complete type, an indicator used to distinguish media data to which the MMT packet belongs from another media data, a one-bit flag, wherein if the one-bit flag has a first value the one-bit flag indicates that the payload includes only one data unit, and if the one-bit flag has a second value the one-bit flag indicates that the payload includes more than one data unit, and payload type information indicating whether the payload includes one or more control messages.

6. The method of claim 5 , wherein if the value indicates that the payload does not include the data unit of the complete type, the value further identifies a position for an incomplete portion of the data unit.

7. The method of claim 6 , wherein the position indicates one of that the incomplete portion is a first fragment of the data unit, the incomplete portion is a last fragment of the data unit, and the incomplete portion is a fragment except for the first fragment and the last fragment among fragments of the data unit.

8. The method of claim 5 , wherein a packet header included in the header region comprises bitrate type information indicating whether a bit rate of the MMT packet is a constant bit rate (CBR), identification information related to a quality of service (QoS) of the MMT packet, and information related to a transmission delay of the MMT packet.